Stenciling-machine.



No.8s144s. y PATEN'TED MAR. 10, 190s. s. TJSMITH, JR.

STBNGILING MACHINE.

APPLIUATION FILED DBO. 13. 1907.

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UNITED srnfrss ...erreur lorries."

STEPHEN l. SMI'lll, JR., OF STAMliORD, CONNECTICUT, ASSIGNQR TOUNDERWOOD'TYPE- WRITER COMPANY, OF NEWXORK, N, Y., A CORPORATION O1"lNEW JERSEY.,

STENCILING-MACHINE i ISpecification of Letters IEatentv.

Patented Maren 101eos."

Application filed December 13, 19 07. Serial No. 406,255. i

To all whom it 'may concer/nf:

Be it known that I., STEPHEN T. SMrrn, Jr., a citizen of the UnitedStates,`residing in Stamford, in theV Jdoiinty `oli' Fairiieldind Stateof Connecticut, have invented certain new and useful Improvements inStenciling- Machines, of which the following is a specification. i

This invention relates to stenciling machines employingr a perforateddrum or cylinder and impermeable waxed stencil sheet, in which the inkis applied to the inside of the drum and percolates or oozes through theperforations in the druin to saturate a pad wrapped around the drumbetweenthe latter and the stencil sheet. The sheets to be stenciled arepassed between said drum and a pressure roller, the pressure. of theroller' squeezing theink from the pad through the stencil upon thesheets.

Wared stencil sheetsM are of varying lengths, according to the amountot' matter it' is desired to stencil or reproduce, and usually of alength lessl than the circumference of the drum, so thatl the ink-pad isnot entirely covered. When ink is accidentally dropped upon such part ofth(` cylinder inclosed by the pad which is' not covered by the stencilsheet, it will soak through the pad, and come into contact with thepressure roller, .lepositing ink thereon, and the. roller in turn daubsthe ink upon tho sheets to be stenciled, vwhereby they are spoiled. v j

The object of the invention is to provide simple, inexpensive andell'ective means to prevent ink from getting upon thepressure roller.-To this end I introduce a thin sheet ol impermeable paper or material,such as celluloid, pyralin or the like, between `the drum and thatportion of thc ink-pad which is not covered by the stencil sheet,therebyv preventing access-otl ink to ,the unused 'portion otl the pad,so that thel pressure roll does not become inked. y ln the accompanyingdrawings, Figure l. is a front elevation oll :L stenciling machinewithmy improvement applied thereto. Fig. 2, shows a set olI tlcxibleinterponent sheets of assorted lengths. Fig. Si is :mend View ol' astencil cylinder, showing diagrammatically the positions ol' the stencilsheet, inkpad and impermeable interposed Iapron. Fig. 4 is aperspectiveview ol a stencil cylindcr or drum. f

sheet.

A stencil machinev usually comprises a base 1, standards 2, 8,and-acylinder or drum 6 provided` with anhandle` 7'. vThe `drum usuallycomprises a pair ot' annular heads 8, 9, connected by a hollowcylindrical body of eo foraminoussheetmaterial 10. Runningthe length ofsaid drum, is e.v channel 11.5' An ink-pad 12is wrapped around the drumand secured at its ends in the channel 11. 'A stencil sheet 13 is alsowrapped aroundthe 65 drum over thevink-pad," but onlyV partly encirclingthe drum, and is secured at oneend in the ,channel 11 by a elainping-bar14. lnk is usually applied to the inside of the drum 6 by means of abrush, and percolates 70 through the perforations 6 in the drum tosaturate the pad l2. The sheets to be stencile.l are f`ed between thedrum G and a soft rubber pressure-roller 15, the latter squeezing theink through the stencil on to 7.5 the sheets to be stenciled. The waxedstencil sheet is shown extending from the channel 11 to a point 1.6,(Fig. 4), leaving a portion 17 of the pad exposed. I interpose a sheetof impermeable material 18, such, for distance, as tin, celluloid,pyralin, or'the like, between the drum and such. portion of the ink padas is not in'closed by the stencil Said sheet 18 extends from`a pointl?) near the channel 1i t0 a point where it is 85 overlapped by thelower end vof the stencil sheet 13, as at 20.

In Fig. 3 is shown diagramlnatically the relative positions of the inlpad 12, extending completely around the drum and secured 90 `at its endsin the channel 1l g the stencil sheet 13, secured at one end in thechannel ll and extending to the point 16, leaving the portion 17 ot thepad l2 uncovered; 'and the impermeable sheet or protecting shield 1S,ex- 95 ,tending from the point \1) to the point 20, where it is slightlyoverlapped by the stencil sheet 1.3.

rial interposed between the drum and ink- 2 l esaminay pad to cov ersuoli perforaizions in the drum ns are out of use.

2. ln a stencilingl machine provided with :1. perforate( drinn, thecombination with an 'inkpad arid a stencil sheet wrapped around Saiddruri, of a flexible sheet of eelhxloid Wrapped around the drum withintheI ink- -padg and overlapping the lower' end of the stencil sh eet andcoverlng the remaining,r per- ,forations 1n the druni.

3. In :t stenciling machine., thc combination with a perforated drum, ofan ink-pad Wrapped around said druni7 a Stencil sheet Wrapped around theink-pad, but only partly en circling .the drum, and a sheet ofimpermeable material interposed between the l drunrard ink-pad to covertno perforated portion of the drum not inclosed by the stenoilsheet. y

`4.V In a Stenciling machine pro vided with a perforated drum and apressure-roller, the

combination with an 'ink-pad wrapped.

around said drum, andaJ stencilsheet also Wrapped around sind drum overtne lnk-pad printing surface of the drum, of a stencil sheet alsowrapped around the druin over the ink-pad but only partly encircling thedrum, said stencil sheet secured at one end in the channel by a clampingbar, and a sheet of inipernieahle material interposed between the drumand the ink-pad and. extending from the channel to a point where it isoverlapped by the lower end of the stencil sheet. STEPHEN T. SMITH, Jn.l/Vitnesses JOHN O. SEIFERTA K. FRANKFORT.

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